/*******************************************************************************
 * Copyright 2017 Bstek
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License.  You may obtain a copy
 * of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations under
 * the License.
 ******************************************************************************/
package com.bstek.ureport.console;

import java.lang.reflect.Method;
import java.net.URLDecoder;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;


/**
 * @author Jacky.gao
 * @since 2016年6月3日
 */
public abstract class BaseServletAction implements ServletAction {
    protected Throwable buildRootException(Throwable throwable) {
        if (throwable.getCause() == null) {
            return throwable;
        }
        return buildRootException(throwable.getCause());
    }

    protected String decode(String value) {
        if (value == null) {
            return value;
        }
        try {
            value = URLDecoder.decode(value, "utf-8");
            value = URLDecoder.decode(value, "utf-8");
            return value;
        } catch (Exception ex) {
            return value;
        }
    }

    /**
     * 解除转义
     *
     * @param content
     * @author ljk
     * @since 2022-07-08 22:05
     */
    protected String decodeContent(String content) {
        if (content == null) {
            return content;
        }
        try {
            content = URLDecoder.decode(content, "utf-8");
            return content;
        } catch (Exception ex) {
            return content;
        }
    }

    protected Map<String, Object> buildParameters(HttpServletRequest req) {
        Map<String, Object> parameters = new HashMap<String, Object>();
        Enumeration<?> enumeration = req.getParameterNames();
        while (enumeration.hasMoreElements()) {
            Object obj = enumeration.nextElement();
            if (obj == null) {
                continue;
            }
            String name = obj.toString();
            String value = req.getParameter(name);
            if (name == null || value == null || name.startsWith("_")) {
                continue;
            }
            parameters.put(name, decode(value));
        }
        return parameters;
    }

    protected void invokeMethod(String methodName, HttpServletRequest req, HttpServletResponse resp) throws ServletException {
        try {
            Method method = this.getClass()
                                .getMethod(methodName, new Class<?>[]{HttpServletRequest.class, HttpServletResponse.class});
            method.invoke(this, new Object[]{req, resp});
        } catch (Exception ex) {
            throw new ServletException(ex);
        }
    }

    /**
     * 截取出请求的路径
     *
     * @param req
     * @author ljk
     * @since 2022-07-08 21:57
     */
    protected String retriveMethod(HttpServletRequest req) throws ServletException {
        String path = req.getContextPath() + UReportServlet.URL;
        String uri = req.getRequestURI();
        String targetUrl = uri.substring(path.length());
        int slashPos = targetUrl.indexOf("/", 1);
        if (slashPos > -1) {
            String methodName = targetUrl.substring(slashPos + 1).trim();
            return methodName.length() > 0 ? methodName : null;
        }
        return null;
    }

    protected String buildDownloadFileName(String reportFileName, String fileName, String extName) {
        if (StringUtils.isNotBlank(fileName)) {
            fileName = decode(fileName);
            if (!fileName.toLowerCase().endsWith(extName)) {
                fileName = fileName + extName;
            }
            return fileName;
        } else {
            int pos = reportFileName.indexOf(":");
            if (pos > 0) {
                reportFileName = reportFileName.substring(pos + 1, reportFileName.length());
            }
            pos = reportFileName.toLowerCase().indexOf(".ureport.xml");
            if (pos > 0) {
                reportFileName = reportFileName.substring(0, pos);
            }
            return "ureport-" + reportFileName + extName;
        }
    }
}
